I Had Always Thought That,

lava spewing from volcanoes was red or even yellow,

but in a series of stunning pictures photgraper Olivier Grunewald visited Kawah Ijen Volcano, Indonesia, to take these pictures of blue lava,

Kawah Ijen is a part of the Ijen volcano complex – a group of stratovolcanoes in East Java, Indonesia – with an active crater that’s 200 meters deep, the complex is also home to the world’s largest turquoise-colored acidic lake, full of sulfuric acid, so note to self, 'do not fall in!',  

but do not expect to see blue lava in the daytime, Kawah Ijen, an ordinary rocky crater by day, transforms into a stunning display of electric blue light only at night, also taking pictures there is no walk in the park, Olivier tried to capture these otherworldly blue flames in 2008, he lost two lenses and a camera in his quest for the perfect photos, he wore gas masks for the shoot and had to discard his clothing afterward, but looking at the pictures I think it was worth the sacrifice.